CMN8025E NullPointerException messages when inbound MQ queues do not get processed

Technote (troubleshooting)

Problem(Abstract)

After integrating WebSphere Commerce with WebSphere MQ, messages placed on the inbound MQ queues appear to be stuck and do not get processed by the server. Error: com.ibm.commerce.messaging.listener.TransportAdapterSerialDispatcher process() CMN8025E, NullPointerException.

Symptom

When reviewing the SystemOut.log file, there is a NullPointerException similar to the following snippet: